Characterization of Czechoslovak coals from Ostrava-Karviná basin by means of solid state nuclear magnetic resonance spectroscopy
✍ Scribed by Petr Pánek; Gerhard Scheler; Jan Neiser
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 469 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
In this study coals from the Ostrava-KarvinB basin, and their products obtained by extraction using quinoline, were examined. Solid state 'H n.m.r. spectroscopy, employing magic-angle spinning (MAS) and multiple-pulse sequences (BR-24) at 270 MHz gave spectra of coals and coal-derived solids in which aromatic and aliphatic hydrogens were resolved. Solid state 13C n.m.r. spectra were measured using cross polarization (CP) in conjunction with dipolar decoupling (DD) and magic-angle spinning (MAS) at 15.09 MHz. Structural parameters were calculated using modified Brown-Ladner equations, and significant differences could be observed.